Typewriting machine



p 20, 192 7. E. & ROWLEY TYPEWRITING momma Filed 001;. "z, 2

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Patented Sept. 20, 1927,

EDWARD G. ROWLEY, OF BELLEVILLE, NEW JERSEY, asszsnon ro, Unnnnwoon'rYPE- WRITER ooMrANY, or NE YORK, N. 'Y.,A CORPORATION or DELAWARE;

TYrnw'nrrrNGl MACHINE.

Application filed October 7, 1925 This invention jrelates; to a revoluble platen. for typewriters, and its object, is to provide a simple and inexpensive construction which will answer the requirementsof t-ypewriting and also bevery quiet in operation. In securing these ends in'a preferred Jmanner, an ordinary wooden platen core may be converted-into a'spool by cutting it away circumferentially for nearly its entire length, leaving a coreprovided with ahead at each end, for convenience in attaching the usual platen ends The core between these heads is-left cylindrical.

Upon the cylindenof sucha spool is wound fine threads or strands-of cotton ao .forma quiet and locally yieldingbackin'g which is not bodily elastic. =-Many strands may be wound simultaneously This resultcan best ,beobtained by employing the same multi-strand cord which isused in makingcord tires for'automobiles, preferably Sea Island cotton'cord. This automobilecord consists of nuinerousstrands or r fine cords, which are twisted into a'single In making aplaten, the large cord or cable can be untwisted so asto flatten it into the shape of a multiple-ply tape or ribbon of oval cross-section, which is wound'upon said wooden core. In order that the windings may be made smooth and tight, it is proposedlto secure one end of the tape to the small diameter of the spool atone end thereof by overlapping the first turn upon the end of thestape and then 'by rotating the platen to wind the tape tightly therearound thus providing a first layer or primary winding. The-second layer may be in real- ;ity a continuation of the first since the tape may be long enough for a double winding.

. .Upon reaching theend of the platen, thetape is wound backwardlybover' the first layer.

Then the cord issecured to the spool and gthe surplus at the end iszacut lothand'the ,wonnd core will be ofsubstantially uniform 7 \diameter, the. windingjbeing practically smooth-and tighn thereby providinga backingifor theplat enjaeket or easingyand the the noise ofthetype-blows and also suitably back the work wlien manifolding. Over this'assembled core' there is forced an ordinarycloth-lined rubber shell, such as usual.-

ly serves for the inafter appear.

backing will be flexible enough to deaden Serial No.- 61,047.

of'the platen. I It is found that a platen made in this way is excellent for clearness of printing, for manifolding, and for all typewriter purposes, while the tight superposed layers of cord windings give the further efiect of quletness to the, type blows.

Other features and advantages will herethe accompanying" drawings, Fi 'ure 1 is a sideview of the platen,

showlng the first layer of cord partly wound around the small diameter of the wooden core. v

I Figure 2 is a sidev view of the platen, showing the finished core ready to be inserted into the rubber shell. Figure 3 is a fragmentary side view of the platen, showing the core partly inserted into the shell. 7 v Figuret is a cross-sectional view, showing the assembled platen. v

Figure 5 is a cross-sectional view through the line 55 of Figure 4:. large cord or cable and so used in the tires.

Figures 6 and 7 are cross-sectional views of the cord, showing the cord, respectively, in its twisted and untwisted form.

A standard Underwood platen having a wooden core may be advantageously utilized for. the purpose of this invention. Said core may be undercut forming substantially a spool having a small diameter 10 and unturned portions 11 atvthe ends thereof for the purpose of receiving. screws 12, securing end metal caps 13 and 14 to the platen. The

' cap 1 3 has ratchet teeth out on its periphery in a pitch equal to the Width,0jffthetape,

for the purpose of line-spacing the platen, while the'cap 14 is provided with ascrew 15 for securing the, platen to a platen-axle 16.

In order to absorb the shock of the type blows and. thus eliminate the noise ensuing therefrom, there is provided a filler in the spool which substantially repleates the turned-down portion, so that, when the filler is in place, a-core-of'a uniform diameter. will be shell 17. J

The. filler used in 'thisinvention to raise the small diameter 10 to the diameter of the unturned portionsv 11 consists of Sea Island cotton cord, the same as is used for; making automobile tires. Theeord, which may be bought in the market, has a plurality of thin twisted strands, and one of the i TUNITED STATES PATENTQFFICE- printing surface or jacket provided, for receiving a rubber hold the cord against displacement.

varieties preferably used in this invention is known as 36 ply, indicating that it has thirty-six strands, the cord being twisted to about one-eighth of an inch in diameter.

Preparatory to winding the cord around the core of the platen, the same is untwisted so that the strands will be substantially straight and parallel, and then the cord resembles a tape 18, shown in cross-section in Figure T. and is about five-sixteenths of an inch wide. The end 19 of said tape 18 is secured to the wooden core by overlapping the first turn over the end of the cord in a. manner as shown in Figure l, and then the platen is rotated to wind the cord therearound in a pitch equal to the width of the tape. The first ply being of a uniform thicle ness of about tl1ree-sixty-tourths of an inch is wound upon the core. whereupon the last turn at the opposite end of the platen is made to overlap the previous turn, as shown at 520 in lligure 2. A second ply of cord is wound over the :lirst one, the pitch being equal to the pitch of the first ply, and upon completion of the second ply the end of the cord is nailed by means of a staple 21, or is otherwise secured to the spool against displacen'ient.

Since each of the windings is about three-- sixty-tourths of an inch thick, it is obvious that the two windings will represent a total thickness ol three-tliirty-seconds of an inch, which is ample to deaden the noise arising from the type-blows while at the same time providing a strong enough backing to resist the hardest blows when manifolding. The depth oil? the groove turned on the platen should. of course, be slightly less than the total thickness of the cord layers, since the cotton is somewhat flexible and is compressed when the rubber shell is pressed thereon, as shown in l igure 3.

The core of the platen, after the cord has been wound thereon, is shown in Figure 2 in which an additional staple 22 is shown to Upon said core there is provided the rubber shell 17 of standard hardness, the same as is used in the Underwood platens. Said shells are usually cloth-lined and provide a simple and eflicient means for securing the shell to the core. One of the methods commonly used to secure the shell to the core is to glue it thereto, although it could easily be nailed or otherwise secured against displacement.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. A. platen for a typewriting machine including a cylindrical core having a reduced cylindrical diameter extending the full length of the platen except for full-size head curing said core to a platen-axle, tight windings of cord around the turned-drnvn diameter of said core, said diameter between said heads being increased solely by said tight windings to substantially the full diameter of the core so as to form a. core having a uniform diameter, and a printing-surface shell closely fitting over said core.

2. A platen for a typewriting machine including a cylindrical core having a turneddown cylindrical diameter extending sub stantially the full length of the platen except for unturned portions at the ends thereof. means for securing said core to a platen axle, a filler for raising the turned-down diameter of the core to substantially the diameter of the unturned diameter thereof, said filler consisting of a. multiple-strand flattened cord having one end secured to the turned-down diameter of the core at one end thereof, and wound therearound. side by side, at a pitch equal to the width of the cord, so as to provide a. uniform layer ot cord, and then rewound over the first layer to provide a second layer parallel tothe first, the total thickness of the two layers being equal to the depth of the cut in the core, so that the outside diameter of the turned-down portion of the core will be substantially equal to the unturned diameter, and a rubber shell closely fitting over said core. the inside diameter thereof being slightly smaller than the outside diameter of the core.

3. A platen for a typewriting machine having a wooden core. a rubber shell encasing said core, and layers of cotton-cord wound tightly around said core and serving as a backing for the rubber shell to deadcn the noise arising from type-blows upon the rubber shell, said tight windings of cord forming the entire backing between said core and said shell.

4:. A platen for a typewriting ma chine having a wooden core. a rubbershell encasing said core, a double layer of COtl3()11CO-l'('l con sisting solely of tight windings running around said core and serving as a backing for the rubber shell to deaden the noise arising from type-blows upon the rubber shell, heads at the ends of said core, and means for securing the ends of the cord to said wooden core.

5. platen for a typewriting machine including, in combination, a hollow core, means for securing said core to a platen-axle, a tight cord winding over said core for deadening type-blows. and a hard printing-sun face shell encircling and closely fitting over said cord winding, saidtight winding filling the entire space between said core and said shell.

6. A platen for a typewriting machine including, in combination, a hollow core, means for securing said core to a platenportions at the ends thereof, means for seaxle, tight windings of cord upon said core diameter to the outer diameter of the cord winding, presenting a uniform diameter core upon which the hard rubber shell is secured.

7 A platen for a typewriting machine including, in combination, a hollow core, means for securing said core to a platenaXle, a rubber shell of standard hardness, and means between the shell and, the core for deadening the noise arising from type-blows upon the rubber shell, said last-mentioned means including a layer of multiple-strand Sea Island cotton-cord tightly wound upon said core, and a second layer tightly wound upon the first, the ends-of said cord beingj secured to the shell in a manner to prevent its displacement. V

8. A platen for a typewriting machine ineluding, in combination, a hollow core,

means for securing said core to a platenaxle, a rubber shell of standard hardness, and means between the shell and the core for deadening the-noise arising from typeblows upon the rubber shell, said last-mentioned means including a'layer of multiplestrand Sea Island cotton-cord tightly wound upon said core, and a second layer tightly wound upon the first, the ends of said cord being secured to the shell in a manner to prevent its displacement, said core being provided with heads at the ends thereof, the

diameter of said heads being equal to the s outer diameter of the cotton layers, so as to present a core ofuniform diameter to be inserted and secured to the rubber shell.

9. A platen for a typewriting machine including a wooden core, a cotton-cord covering tightly wound around said core, means for securing the cord to said core, the cord being wound in a manner to present two oppositely-slanting cross-Wound layers, each layer being of a uniform thickness, a hard rubber shell over said cotton-covering, and means for concealing the cord at the ends of the platen. V

10. A platen for a typewriting machine including a wooden core, a cotton-cord covering tightly wound around said core, means for securing the cord to said core, the cord being wound in a manner to present two oppositely-slanting cross-wound layers, each layer being of a uniform thickness, a hard rubber shell over said cotton-covering, and

means for concealing the cord at the ends of the platen, said last mentioned means including enlarged heads at the ends of said core and forming an integral part thereof, the diameter of said heads being equal to the inside diameter of the shell.

11. A platen for a typewriting machine including a wooden core, a cord wound therearound, said cord being rigidly at tached atone endof 'said core and being slantingly wound around said core, forming a layer of uniform thickness, a second layer of cord, the cord being wound in an opposite slanting direction to the first layer, and a hard rubber shell closely fitting over the cord windings. 12. A platen for a typewriting machine including a wooden core, a covering for said core consisting solely of a tightly-wound sound-deadening cord, and a rubber layer tightly fitting over said cord-covering.

13. A platen'for a typewriting machine including a wooden core, a cord tightly WOUIlCl around said core, means for securing the cord to said core, the cord being wound in a manner to present two oppositely-slanting cross-wound layers, each layer being of a uniform thickness, a hard rubber shell over said cord, said tight windings filling the entire space between said 'core and said shell, and heads at the ends of said core, the diameter of said heads being equal to the inside diameter of the shell. 

